I'm friends with a lot of guys that bet full time, most making a lot of money each year, they won't use cash out as it's not the value play, they'll hedge or trade their positions to make as much as possible and remain in control of the bet, there's plenty examples online now that many get stung by cash out, most recent one 2 weeks ago was a guy that cashed out his £1 bet for 64p, bet then came in and the return was over £1000, people like that probably shouldn't bet, I also know a guy I went to school with that cashes out at the first chance he gets which in the long run is a massive loser.